This paper presents a low noise CMOS image sensor using column-parallel high-gain signal readout and digital correlated multiple sampling (CMS). The sensor used is a conventional 4T active pixel architecture with a pinned-photodiode as detector. The test sensor has been fabricated in a 0.18μm CMOS image sensor process from TSMC. The random noise from the pixel readout chain is reduced in two st...

This paper presents a dynamic range boosting technique for wireless optical receivers. This technique changes the feedback impedance of the transimpedance amplifier by the control of multiple parallel transistors in the triode region. This strategy results on a wide controllable gain amplifier, without extra signalto-noise ratio penalties. A front-end with 20MHz bandwidth, maximum transimpedanc...

We present a novel method for desiging multiwavelength pumped fiber Raman amplifiers with optimal gain-flatness and gain-bandwidth performance. We show that by solving the inverse amplifier design problem, relative gain flatness well below 1% can be achieved over bandwidths of up to 12 THz without any gain equalization devices. This constitutes a substantial improvement in gain flatness compare...

An experimental investigation of the temperature dependence of the gain and noise performance of a silica-fiber Raman amplifier is described. A decrease in the Raman scattering cross section in a fiber amplifier cooled from a temperature of 300 K to 77 K was measured and found to be in agreement with theoretical values. No difference between the Raman gain coefficients at these two temperatures...

We describe a fully differential amplifier for oversampled A/D converter applications. This amplifier employs a single stage telescopic architecture using both N-type and P-type gain-boosting technique with capacitive feedback. This architecture offers extremely high gain, low noise, low power and the need for compensation. But the potential slow-settling problem due to the slow doublet should ...

An EEG acquisition system using 0.18μm technology is proposed. EEG input signals are of the range of few micro-voltage. Hence a high gain operational transconductance amplifier with gain of 62.45dB is designed for the acquisition system. The proposed amplifier and multiplexer have been tested for the EEG signals and their performance is reported at operating voltage of 1.8 volts. This design ca...

In this study, an eight-channel wide-band intermediate frequency (IF) receiver with S-band input frequency, output of 200 MHz, and a signal bandwidth 160 MHz was developed. The performance measurement results the IF showed that fundamental second harmonic were involved in output. This caused by nonlinearity characteristics final stage amplifier. Therefore, amplifier changed to differential ampl...

This paper exploits the unique ambipolar conduction property of graphene field effect transistors to realize a single transistor polarity controllable amplifier. The amplifier is polarity controllable since its small signal gain can be switched between positive and negative modes through proper biasing. Polarity controllable amplifiers can greatly simplify communication circuits in applications...

This report presents the analysis of lumped, lossless networks configured to emulate ideal transmission line characteristics over broad frequency passbands. The filter sections are configured to allow for the realization of distributed amplifiers capable of processing signal frequencies extending through tens of gigahertz. The principle advantage of the distributed approach to broadband amplifi...

Following the suggestion made in the Quarterly Progress Report of January 15, 1955, we have built a variable-gain bandpass amplifier, centered at 9. O0 Mc/sec and having a nominal bandwidth of 1. 7 Mc/sec, with tetrode transistors. The amplifier in Fig. X-l consists of four synchronously-tuned stages, two of which are gain-controlled by means of constant-resistance agc attenuators. The pertinen...